How can I get in-state tuition for Arizona?

How much is tuition at Grand Canyon University, Arizona?

As of 2009, the cost of undergraduate tuition at Grand Canyon University in Arizona is: $687.50 per credit if you are taking one to 11 credits, $8,250 if you are taking a block of 12 to 18 credits,...
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If you are 15 and your boyfriend is 18 and you got pregnant can you move out of your parents house and move in with him in the state of Arizona?